Different varieties, different appearances, and different tastes.

1. Different varieties: Crown pear belongs to white pear species and is a hybrid variety, while Sydney pear belongs to snow pear species and likes light and temperature. It is an older pear variety.

2. Different appearance: Crown pear is oval-shaped, with smooth skin and small fruit spots, while Sydney pear is round or oblate, with rough skin and larger fruit spots.

3. Different tastes: Crown pear has a delicate and juicy taste, thin skin and crispy flesh, while Sydney pear has a rougher taste and thicker skin.